<!DOCTYPE html>
<html>
    <head>
        <title>HW2_3170104848</title>
        <meta charset="UTF-8">
        <script type="text/javascript" src="constant.js"></script>
        <script type="text/javascript" src="main.js"></script>
    </head>
    <style>
        body {
          background-color: #aaaaaa;
        }
    </style>
    <body onload="main()">
        <center>
            <div><canvas id="treemap"></canvas></div>
            <div><button id="change" onclick="change()">更改数据</button></div>
        </center>
        
    </body>
</html>